> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-includ-1787937986-142acd1.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Backend integrations

> Filesystem backends for Deep Agents.

Browse available filesystem backends for Deep Agents or contribute your own to the ecosystem. Learn more about how backends work in the [backends docs](/oss/javascript/deepagents/backends).

## Share your backend

Custom backends connect Deep Agents to storage systems such as databases, object stores, and virtual filesystems. Share yours with the community:

<CardGroup cols={2}>
  <Card title="Implement a custom backend" icon="database" href="/oss/javascript/deepagents/backends#custom-backends">
    Follow the custom backends guide to build your own backend.
  </Card>

  <Card title="Share a community backend" icon="users" href="https://github.com/langchain-ai/docs">
    Open a PR to the docs repo to add your backend to the table below.
  </Card>
</CardGroup>

## All backends

| Backend                                                                                                                  | Description                                                                                                                                                | Package                            | Source                                                                                                                                |
| ------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| [Azure Blob Backend](https://github.com/langchain-ai/langchain-azure/tree/main/libs/azure-storage)                       | Azure Blob Storage implementation of the Deep Agents `BackendProtocol`. Persist agent workspace files, memories, and artifacts in a blob container.        | `langchain-azure-storage`          | [`langchain-ai/langchain-azure`](https://github.com/langchain-ai/langchain-azure/tree/main/libs/azure-storage)                        |
| [MongoDB VFS Adapter](https://github.com/langchain-ai/langchain-mongodb/tree/main/libs/langchain-mongodb-deepagents-vfs) | Virtual filesystem backend backed by MongoDB Atlas. Persist agent files, including memories, artifacts, and conversation history, in a MongoDB collection. | `langchain-mongodb-deepagents-vfs` | [`langchain-ai/langchain-mongodb`](https://github.com/langchain-ai/langchain-mongodb/tree/main/libs/langchain-mongodb-deepagents-vfs) |

Have a backend to share? [Open a PR](https://github.com/langchain-ai/docs) to add it here.

<Info>
  If you'd like to contribute an integration, see [Contributing integrations](/oss/javascript/contributing#add-a-new-integration).
</Info>

***

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